Metadata for different functional areas in Portal

I am trying to solve how to have varying metadata sets for differentfunctional areas within one portal. We are using a modified Dublincore metadata strategy, and need to show different controlledvocabulary depending on the functional area.

1) We have site definitions for level 1, 2 and 3 of the portalsite and based on these site definitions we have already created theareas and sub areas accordingly.

2) We have around 500-600 areas that are using these sitedefinitions.

3) Based on these site definitions files, the documentlibraries have been created in the respective area and the Meta dataproperties and values are showing up as they have been defined inthe schema.xml under the doclib folder for the respective sitedefinitions.

4) At this if we want some new value to be added to theschema, we can surely modify the schema.xml and then the same wouldshow up on all the areas that use these site definitions.

5) We have 10-12 business units and each of these businessunits now require different values to show up in the combo boxeswhen a document is uploaded in the document library. If we updatethe schema.xml all the business units will see the same values whichwe don't want.

6) Is there some way to apply a document library schematemplate to each of these business units now that they have beenalready created?

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